Doubletree



(No Model.)

M. B. MORRISON. DOUBLBTREE.

' No. 419,535. Patented Jan. 14,1890.

' in their movement.

UNITED STATES PATENT OFFICE.

MAJ OR B. MORRISON, OF NORTH YAKIMA, WASHINGTON.

DOUBLETREE.

SPECIFICATION forming part of Letters Patent No. 419,535, dated January 14, 1890.

Application filed July 23, 1889. Serial No. 318,356. (No model.)

To all whom it may concern:

Be it known that I, MAJOR B. MORRISON, a citizen of the United States, residing at North Yakima, in the county of Yakima and Territory of Washington, have invented a new and useful Doubletree, of which the following is a specification.

My invention relates to improvements in doubletrees; and it consists in certain novel features hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a plan view of my improved doubletree. Fig. 2 is a similar view with a part removed. Fig. 3 is a detail perspective view.

The frame A of my improved doubletree may be of any-desired construction; but it is preferably constructed of sheet metal, as shown in the drawings, so asto combine lightness with strength. Within the frame, at the center of the same, I secure the pin B, to which the inner ends of coiled springs O are secured, and to the outer ends of said springs I secure the connecting-rods D, which extend outward therefrom and project through the ends of the frame. The frame is provided at its ends with the guide-arms E, having longitudinal slots F, through which the connecting-rods pass, and by which they are guided The frame is also provided at its ends with the lugs F, and between the said lugs I pivotthe levers G, to the front ends of which the singletrees are secured. The rear ends of these levers G are provided with the series of openings H, in any one of which the ends of the connectingrods D are secured. These openings provide means for regulating the tension of the springs according to the weight of the. load being hauled.

From the foregoing description, taken in connection with the accompanying drawings, the construction of my device will be readily understood, and the operation of the same is thought to be obvious. The draft animals are harnessed to the wagon in the usual manner, and the wagon is drawn along, as will be readily understood. Should the vehicle strike an obstruction in the road the team will forge slightly ahead, and if the ordinary doublet-ree were employed it would be liable to chafe their shoulders. W'ith my device, however, when the team starts forward, the levers G are drawn on and the springs stretched,there by relieving the strain on the team due to drawing the vehicle over obstructions or in starting the load after a stop has been made. After the obstruction has been passed or the vehicle is started the springs resume their normal position and draw the levers inward and rearward, so that the draft will be applied directly to the vehicle.

My device is very simple, and its advantages are thought to be obvious.

Having thus described my invention, what I claim, and desire to secure by Letters Patent,

1. The combination of the frame, the levers pivoted to the ends of the same and provided at their rear ends with a series of openings,

and having their front ends adapted to be se-' cured to the singletrees, the springs arranged Within the frame, and connecting-rods between the springs and the levers, the outer ends of said rods being secured in one of the openings in the levers, as set forth.

2. The combination of the frame provided at its ends with the arms E, having the slots F, the levers pivoted to the ends of the frame, the springs arranged within the frame, and the connecting-rods between the springs and the levers, the said rods passing through the slots F, as set forth. I

In testimony that I claim the foregoing as my own I have hereto-affixed my signature in presence of two witnesses.

MAJOR B. MORRISON. Witnesses:

J. O. MACCRIMMON, ROBERT ORoRY. 

